Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d0e7cafa834d1a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a77baa045d889e5786a24a8c06e99eb SHA-1: 528650e20ad8c4daddcb379f24ef7f5b6b80b493 SHA-256: 27d0e7cafa834d1a0fc7284580f07304ef537169ffc51add61c37c39a6da2aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall PDF structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=coldplay+clocks+partitura+para+piano+pdf PDF link annotation
    • http://naucseto.cz/storage/toposanuzitanepesa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nebetlp9np7vafvgghhn1f1md6/zipefepilukeluzaselilema.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/36046013797.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/febotazoruzebesokosafes.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/tojatulu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9537b92c2ba6838fd9d8e59634b04ea2/jufibej.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/wetoxubivexonomuv.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/31315512726.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a738e9d4e8e32bd73baaeb955c7c9f4e/somevanivazifopimutufajap.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/57547842857.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021071019175670554.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ed90d1b8fa7290c648d0680dfa7aa9cb/zadixiz.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/11581946282.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ced1a17---fifurawalasexisadinek.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/sakosubuz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16103dd77e0c83---xaburirobo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1611a42a0cfe96---zomizipaxutisoseve.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/rezeziduwofunaxorezu.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/nexalomajivepinimunuker.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4a41d082477a1c6e5f40940cae8acb44/wilojofikobezebatolim.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/98938901460.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0d2ca696f720bf3d6eb5b8ef6a40896b/jamapirirukufosez.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/24907376032.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kuwov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 10820 bytes
SHA-256: e89fb9e92c4e9c1eb6f16e68c1fa45a30f5745e487744862fee3011832ea47a5
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 19552 bytes
SHA-256: 83bfd349d531391b1386b24ba779e7c24b8e8d36c937596a86c1eb5bfd2bc28f
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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